@Martinhb
If you upgraded, your old contract just morphs into the new one so you carry on as before but just pay the new contract price.
If you took a new contract, you can call O2 to migrate your number to the new contract, which will then end your old one, or otherwise, how to cancel here Guide: Cancelling Your Contract
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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